WO2016101826A1

WO2016101826A1 - Method and system for implementing nested protection

Info

Publication number: WO2016101826A1
Application number: PCT/CN2015/097579
Authority: WO
Inventors: 卢鸿飞
Original assignee: 中兴通讯股份有限公司
Priority date: 2014-12-23
Filing date: 2015-12-16
Publication date: 2016-06-30
Also published as: CN105792028A; CN105792028B

Abstract

Disclosed are a method and a system for implementing nested protection. The method comprises: setting delay timers corresponding to different paths in a protection group respectively, where timing times of delay timers corresponding to an innermost-layer path are set to a specific value, and timing times of delay timers corresponding to an outer-layer path are set to a value greater than the specific value; and when it is detected that a failure changes, acquiring a timing time of a delay timer corresponding to a path of a location where the failure changes; when the timing time is the specific value, calculating a state of the protection group; and when the timing time is not the specific value, starting the delay timer corresponding to the path of the location where the failure changes, after the timing time of the delay timer is reached, detecting again whether the change of the failure does not change, and when the change does not change, calculating the state of the protection group.

Description

Method and system for implementing nested protection

Technical field

This application relates to, but is not limited to, a transport network based protection control technique.

Background technique

As the demand for bandwidth in network services grows, operators and system manufacturers are constantly considering the issue of improving service delivery technologies. The evolution of the digital transport network has also evolved from the original T1/E1-based first-generation digital transport network to the second-generation digital transport network based on SONET (Synchronous Optical Network)/SDH (Synchronous Digital Hierarchy). (Optical Transport Network) based third generation digital transport network. As a next-generation transport network, the network environment faced by OTN is more complicated, and the survivability of its network is a very important issue for OTN.

From the network level, the current network can be multi-layered, and the problem of how to coordinate the processing of the protection switch at multiple levels is more prominent. Therefore, a solution is needed to enable the server layer protection switch to solve the problem before the client layer switching occurs.

Summary of the invention

The following is an overview of the topics detailed in this document. This Summary is not intended to limit the scope of the claims.

The solution mentioned in the G.873.1 standard is that each protection group should be equipped with a hysteresis timer that can be provisioned to handle the protection cascade/nesting problem. However, there are still some problems in this way. When the work or protection path nesting protection levels are different, the protection group waits for unnecessary time without restriction, instead of fast protection switching, so that the time of service interruption grows unnecessarily, that is, cannot be satisfied. Different paths (work or protection) have different nesting levels.

This paper overcomes the problem of the unnecessary increase of the protection switching time caused by the different nesting levels of the working/protection paths in the above standard technology, and provides a scheme in which different paths in the protection group adopt different delay timers.

A method of implementing nested protection, including:

The delay timers corresponding to the different paths in the protection group are respectively set, and the timings of the delay timers corresponding to the innermost path are all set to specific values, and the timing time of the delay timer corresponding to the outer path is set to be larger than the specific value;

When it is detected that the fault has changed, the timing of the delay timer corresponding to the path where the fault occurs is obtained, and when the obtained timing time is the specific value, the state of the protection group is calculated; when the acquired timing time is not When the specific value is used, the delay timer corresponding to the path where the fault is changed is started. After the timing time of the delay timer arrives, the change of the fault is detected again, and the state of the protection group is calculated when the change is not changed.

Optionally, the innermost path is a path that does not include other protection groups on the path; and the outer path is a path that includes other protection groups on the path;

Setting the timing time of the delay timer corresponding to the outer path to be greater than the specific value includes:

Set the timing of the delay timer corresponding to the outer path to T1+T2; T1 is the maximum value of the delay time of the delay timer corresponding to each path in the protection group included in the outer path; T2 is greater than or It is equal to the time that the included protection group completes the protection switching.

Optionally, the specific value is zero.

Optionally, the stall timer is located in a controller of the protection system.

Optionally, each of the delay timers is respectively located in a detector of a path corresponding to the protection system;

The calculating the protection group status includes:

The detector reports the change of the fault to a controller in the protection system, and the controller calculates the state of the protection group.

A system that implements nested protection, including:

a delay timer corresponding to a different path in the protection group;

Set the module, set to: respectively set the delay timer corresponding to different paths in the protection group, The timing of the delay timer corresponding to the innermost path is set to a specific value, and the timing of the delay timer corresponding to the outer path is set to be greater than the specific value;

The execution module is configured to: when detecting the change of the fault, obtain the timing of the delay timer corresponding to the path where the fault occurs, and calculate the state of the protection group when the obtained timing time is the specific value; The delay timer corresponding to the path where the fault is changed when the timing is not the specific value, and the change of the fault is not changed after the timing of the delay timer is reached, and is not changed when the fault is not changed. Protect the group status.

The setting module is configured to: set a timing time of the delay timer corresponding to the outer path to T1+T2; and T1 is a timing time of the delay timer corresponding to each path in the protection group included in the outer path The maximum value in T2 is greater than or equal to the time that the included protection group completes the protection switching.

Optionally, the specific value is zero.

Optionally, the stall timer and the execution module are located in a controller of the protection system.

One execution module is set in the detector of each path;

The execution module is configured to report the change of the fault to a controller of the protection system, and the controller calculates the state of the protection group.

A computer readable storage medium storing computer executable instructions for performing the method of any of the above.

The method and system according to the embodiment of the present invention achieve the effect of reducing the service interruption time compared with the related art.

Other aspects will be apparent upon reading and understanding the drawings and detailed description.

BRIEF abstract

FIG. 1 is a schematic flowchart of a method for implementing nested protection according to an embodiment of the present invention;

Figure 2 is a schematic diagram of the protection system architecture.

FIG. 3 is a schematic diagram of implementing protection nesting by a controller.

Figure 4 is a schematic diagram of protection nesting by a detector.

5 is a schematic diagram of an OCH (optical channel) 1+1 protection working path nested OTS (optical transmission segment layer) 1+1;

FIG. 6 is a schematic diagram of a system for implementing nested protection according to an embodiment of the present invention.

Embodiments of the invention

Embodiments of the present invention will be described below with reference to the accompanying drawings.

It should be noted that the embodiments of the present invention and the various features in the embodiments may be combined with each other if they do not conflict. Additionally, although logical sequences are shown in the flowcharts, in some cases the steps shown or described may be performed in a different order than the ones described herein.

The embodiment of the invention provides a method for implementing nested protection, as shown in FIG. 1 , which includes:

Step 101: Set a delay timer corresponding to different paths in the protection group, set a timing of the delay timer corresponding to the innermost path to a specific value, and set a timing time of the delay timer corresponding to the outer path to be greater than The specific value;

Step 102: When it is detected that the fault changes, obtain the timing of the delay timer corresponding to the path where the fault occurs, and calculate the protection group state when the acquired timing time is the specific value; when the acquired timing If the time is not the specific value, the delay timer corresponding to the path where the fault is started is changed. After the timing of the delay timer arrives, the change of the fault is detected again. If the change is not changed, the protection group status is calculated. .

Among them, the change of the fault includes the fault and the fault disappears; when the fault changes to the fault, the change does not change means that the fault still exists; when the fault changes to the fault disappears, the change does not change means the non-existence malfunction.

The innermost path is a path that does not include other protection groups on the path, and may be a work. The path may also be a protection path; the outer path is a path containing other protection groups on the path, and may be a working path or a protection path;

Setting the timing time of the delay timer corresponding to the outer path to be greater than the specific value may include:

Wherein, the specific value may be, but is not limited to, zero.

In one implementation, the stall timers may all be located in a controller of the protection system.

In another implementation, each of the stall timers may be located in a detector of a path corresponding to the protection system.

The foregoing two implementation methods included in the embodiments of the present invention include:

Method 1: Set the controller to implement different paths using different delay timer methods.

The architecture of the protection system is as shown in FIG. 2, and each protection system has a controller 21, a plurality of detectors 22, a plurality of actuators 23, and a protocol transmitter 24, wherein the detector 22 is responsible for fault collection and reporting. The controller 21 is responsible for processing the external input and performing protocol calculations to derive the final state of the protection group, the executor 23 is responsible for performing the switching operation, and the protocol transmitter 24 is responsible for delivering the protocol signaling.

In order to implement different methods of different delay timers (Holdoff-timer), different delay timers 25 can be enabled in the controller 21 for different external inputs (alarms), as shown in FIG. 3 (only shown in FIG. 3) A stall timer is shown as an illustration, and does not mean that there is only one delay timer, and the delay timer 25 is located in the controller 21.

In the first method, the method for implementing nested protection includes the following steps:

The first step begins with protecting the group configuration.

In the second step, the timing of the delay timer of the first working path W1 in the protection group is TW1, the timing of the delay timer of the second working path W2 is TW2, and so on, and the Nth working path WN is set. The delay time of the delay timer is TWN.

The third step sets the delay time of the delay timer of the first protection path P1 in the protection group to TP1, the timing of the delay timer of the second protection path P2 is TP2, and so on, and the timing of setting the delay timer of the Mth working path PM is TPM.

In the second step and the third step, the timing time of the delay timer corresponding to the innermost working path/protection path is set to 0, and the innermost protection group is directly included (that is, the protection of the other protection group is not included in the path). The timing time M1 of the delay timer corresponding to the path A1 (which may be the working path or the protection path) is set to be greater than or equal to M (M is the step size, and the protection switching of the inner layer of M time can be completed); The timing M2 of the delay timer corresponding to the path M2 (which may be the working path or the protection path) of the protection group in which the path A1 is located is set to be greater than or equal to M1+M (may be, but not limited to, 2M); and so on.

The fourth complete protection group configuration.

In the fifth step, when the Wi (or Pj) path fault changes, here is an example of generating a fault. After the detector detects that the alarm is reported to the controller, the controller checks the timing of the TWi (or TPj), if TWi (or TPj) When the timing time is 0, the protocol is immediately calculated to obtain the protection group status. If the timing time of TWi (or TPj) is not 0, the TWi (or TPj) delay timer is started, when the TWi (or TPj) timer When the failure (that is, the timing time arrives), first check whether the detector Wi (or Pj) still has a fault. If there is still a fault (the fault can be different from the originally reported fault), enter the protocol calculation to obtain the protection group status. If the fault does not exist, no action is taken.

Method 2: Different detectors are used to implement different paths using different delay timer methods.

In order to implement different delay timers for different paths, different delay timers 25 can be enabled in each detector. As shown in FIG. 4, the delay timer 25 is located in the detector (only shown in FIG. 4). A stall timer is used as a schematic and does not mean that there is only one delay timer.

In the second method, the method for implementing nested protection includes the following steps:

The first step is to set the detector of the innermost path and set the delay time of the delay timer to zero.

In the second step, the detector of the sub-layer path is set, and the timing of the delay timer is set to be greater than or equal to M, and M is the step size. It is considered that the protection switching of the inner layer of the M time can be completed.

......

In step N, the detector of the outgoing layer path is set, and the timing of setting the delay timer is greater than or equal to (N-1)M. N is the total number of layers.

Step N+1, configure the protection group for each layer.

In step N+2, when the detector of the i-th (i<N+1) layer path detects that the fault has changed, here is an example of generating a fault, and the timing of the delay timer of the layer is not 0. Then, the delay timer of the layer is started, waiting for (i-1) M time, when the timing of the delay timer of the layer is reached, it is detected whether the fault still has a fault, if there is still a fault (the fault can be initially The reported fault is not the same. The fault is reported to the corresponding controller. The controller calculates the status of the protection group and sends it to the actuator for execution. Otherwise, if the fault does not exist, no action is taken.

The following two embodiments are used to illustrate the application of the above two methods in the present application. In the two embodiments, the fault is generated as a change of the fault, and the situation when the fault disappears is similar:

Embodiment of method one:

Take the protection nesting of Figure 5 as an example to illustrate how the controller implements the protection of the nested stall timer. In Figure 5, w refers to the working path and p refers to the protection path.

Figure 5 is a schematic diagram of the OCH1+1 protection working path nested OTS1+1. The client side is OCH1+1 protection, and the service layer is OTS1+1 protection. The OTS1+1 protection of the service layer is only OCH1+1 protection on the customer side. The working path is implemented.

The first step is to configure the OTS1+1 protection group. The OTS1+1 protection group is located at the innermost layer. Therefore, the OTS1+1 protection working path delay timer and the protection path delay timer of the protection group controller are set. Is 0.

The second step is to configure the OCH1+1 protection group. The OTS1+1 protection group is nested in the OCH1+1 protection group. There is no nesting in the protection path. Therefore, the OCH1+1 protection in the protection group controller will be implemented. The working time of the working path delay timer is set to T (T is not 0, T is greater than or equal to the time when the nested OTS1+1 protection group completes the protection switching), and the delay time of the protection path delay timer is set to 0. .

The third step is that when the location 1 on the working path of the OTS1+1 protection group fails, the detector of the OTS1+1 protection group and the detector of the OCH1+1 protection group will detect the alarm and report it to the respective controller, OTS1. After receiving the alarm, the controller of the +1 protection group finds that the delay time of the working path delay timer is 0, and immediately calculates the protocol and obtains the state as a reverse state; the controller of the OCH1+1 protection group finds the working path after receiving the alarm. If the delay time of the delay timer is T, the timer is started. When the timer time T is reached, and the detector has no alarm, the protocol does not need to be entered and no processing is performed.

Step 4: When the location 2 on the protection path of the OCH1+1 protection group fails, the detector of the OCH1+1 protection group detects the alarm and reports it to its controller. After receiving the alarm, the controller finds the working path. If the delay time of the delay timer is 0, the protocol calculation is entered immediately, and the protection group status is working.

Embodiment of method two:

The protection nesting of FIG. 5 is taken as an example to illustrate how the detector implements the protection of the nested stall timer.

The first step is to configure the delay timer of the detector in the OTS1+1 protection domain. The OTS1+1 protection group is located at the innermost layer, so the timing of the delay timer of the detector in the OTS1+1 protection domain is set to zero.

The second step is to configure the delay timer of the detector in the OCH1+1 protection domain. The OTS1+1 protection group is nested with the OTS1+1 protection group in the OCH1+1 protection group. There is no nesting in the protection path, so the OCH1+1 protection domain working path is The timing of the stall timer of the upper detector (excluding the OTS1+1 protection domain) is set to T (T is not 0), and the timing of the delay timer of the detector on the protection path is set to zero.

The third step is that when the location 1 on the working path of the OTS1+1 protection group fails, the detector of the OTS1+1 protection group and the detector of the OCH1+1 protection group will detect the alarm, because OTS1+1 If the timing of the detector delay timer of the protection group is 0, the alarm is immediately reported to the controller. The controller calculates the status of the protection group as a reverse state and sends it to the actuator for execution. The OCH1+1 protection group The timer of the detector delay timer on the working path is T, so the detector starts the delay timer. When the timing of the delay timer expires, the fault has disappeared because the OTS1+1 protection group has been switched. Therefore, no operation is performed, that is, the alarm is not reported to the controller.

Step 4: When the location 2 on the protection path of the OCH1+1 protection group fails, the detector of the OCH1+1 protection group detects the alarm, due to the delay of the detector delay timer of the OCH1+1 protection group on the protection path. The time is 0, so the alarm is immediately reported to the OCH1+1 protection group controller, and the controller enters the protocol calculation to obtain the protection group status as the working state.

As shown in FIG. 6, the embodiment of the present invention further provides a system for implementing nested protection, including:

a delay timer 25 corresponding to a different path in the protection group;

The setting module 61 is configured to: respectively set the delay timer 25 corresponding to different paths in the protection group, set the timing time of the delay timer 25 corresponding to the innermost path to a specific value, and set the delay timer corresponding to the outer path The timing time of 25 is set to be greater than the specific value;

The execution module 62 is configured to: when detecting the change of the fault, obtain the timing time of the delay timer 25 corresponding to the path where the fault occurs, and calculate the protection group state when the acquired timing time is the specific value; When the acquired timing time is not the specific value, the delay timer 25 corresponding to the path where the fault occurs is changed, and the change of the fault is not changed after the timing time of the delay timer 25 is reached. The protection group status is calculated when it has not changed.

The innermost path is a path that does not include other protection groups on the path; the outer path is a path that includes other protection groups on the path;

The setting module 61 is configured to: set a timing time of the delay timer 25 corresponding to the outer path to T1+T2; T1 is a delay timer corresponding to each path in the protection group included in the outer path. The maximum value in the timing time; T2 is greater than or equal to the time that the included protection group completes the protection switching.

Wherein, the specific value may be 0.

The stall timer 25 and the execution module 62 may be located in a controller of the protection system.

Wherein, each of the delay timers 25 can be respectively located in a detector of a path corresponding to the protection system;

One of the execution modules 62 may be disposed in the detector of each path;

The execution module 62 is configured to report the change of the fault to a controller of the protection system, and the controller calculates the state of the protection group.

One of ordinary skill in the art will appreciate that all or a portion of the steps of the above-described embodiments can be implemented using a computer program flow, which can be stored in a computer readable storage medium, such as on a corresponding hardware platform (eg, The system, device, device, device, etc. are executed, and when executed, include one or a combination of the steps of the method embodiments.

Alternatively, all or part of the steps of the above embodiments may also be implemented by using an integrated circuit. These steps may be separately fabricated into individual integrated circuit modules, or multiple modules or steps may be fabricated into a single integrated circuit module. achieve.

The devices/function modules/functional units in the above embodiments may be implemented by a general-purpose computing device, which may be centralized on a single computing device or distributed over a network of multiple computing devices.

When the device/function module/functional unit in the above embodiment is implemented in the form of a software function module and sold or used as a stand-alone product, it can be stored in a computer readable storage medium. The above mentioned computer readable storage medium may be a read only memory, a magnetic disk or an optical disk or the like.

Industrial applicability

The embodiment of the invention can overcome the problem of unnecessary increase of the protection switching time caused by the different nesting levels of the working/protection paths existing in the related standard technologies, and achieve the effect of reducing the service interruption time.

Claims

A method of implementing nested protection, including:

The delay timers corresponding to the different paths in the protection group are respectively set, and the timings of the delay timers corresponding to the innermost path are all set to specific values, and the timing time of the delay timer corresponding to the outer path is set to be larger than the specific value;

When it is detected that the fault has changed, the timing of the delay timer corresponding to the path where the fault occurs is obtained, and when the obtained timing time is the specific value, the state of the protection group is calculated; when the acquired timing time is not When the specific value is used, the delay timer corresponding to the path where the fault is changed is started. After the timing time of the delay timer arrives, the change of the fault is detected again, and the state of the protection group is calculated when the change is not changed.
The method of claim 1 wherein:

The innermost path is a path that does not include other protection groups on the path; the outer path is a path that includes other protection groups on the path;

Setting the timing time of the delay timer corresponding to the outer path to be greater than the specific value includes:

Set the timing of the delay timer corresponding to the outer path to T1+T2; T1 is the maximum value of the delay time of the delay timer corresponding to each path in the protection group included in the outer path; T2 is greater than or It is equal to the time that the included protection group completes the protection switching.
The method of claim 1 wherein:

The specific value is zero.
The method of claim 1 wherein:

The stall timer is located in the controller of the protection system.
The method of claim 1 wherein:

Each of the delay timers is respectively located in a detector of a path corresponding to the protection system;

The calculating the protection group status includes:

The detector reports the change of the fault to a controller in the protection system, and the controller calculates the state of the protection group.
A system that implements nested protection, including:

a delay timer corresponding to a different path in the protection group;

The setting module is configured to: respectively set a delay timer corresponding to different paths in the protection group, set a timing time of the delay timer corresponding to the innermost path to a specific value, and set a timing time of the delay timer corresponding to the outer path. Set to be greater than the specific value;

The execution module is configured to: when detecting the change of the fault, obtain the timing of the delay timer corresponding to the path where the fault occurs, and calculate the state of the protection group when the obtained timing time is the specific value; The delay timer corresponding to the path where the fault is changed when the timing is not the specific value, and the change of the fault is not changed after the timing of the delay timer is reached, and is not changed when the fault is not changed. Protect the group status.
The system of claim 6 wherein:

The innermost path is a path that does not include other protection groups on the path; the outer path is a path that includes other protection groups on the path;

The setting module is configured to: set a timing time of the delay timer corresponding to the outer path to T1+T2; and T1 is a timing time of the delay timer corresponding to each path in the protection group included in the outer path The maximum value in T2 is greater than or equal to the time that the included protection group completes the protection switching.
The system of claim 6 wherein:

The specific value is zero.
The system of claim 6 wherein:

The stall timer and the execution module are located in a controller of the protection system.
The system of claim 6 wherein:

Each of the delay timers is respectively located in a detector of a path corresponding to the protection system;

One execution module is set in the detector of each path;

The execution module is configured to report the change of the fault to a controller of the protection system, and the controller calculates the state of the protection group.
A computer readable storage medium storing computer executable instructions for performing the method of any of claims 1-5.